Auxiliary keyboard for calculating-machines.



AUXlUARY KEYBOARD FOR CALCULATING MACHINES. APPucATloxflLEn ocT. I4, 1912.

1, 173,640. Patented Feb. 29, 1916.

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G. J. BARRETT. AUXILIARY KEYBOARD FOR CALCULATING MACHINES.

APPLICATION. FILED OCT. I4, 1912.

Patented Feb. 29, 1916.

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UXXLAEY KEYBARD FR CALCUtLATNG-lvCHIENES.

Specification of Letters Patent.

retten-tea es. ier

pliant-ion ic october 1912. Serien* No. e

To @ZZ wiwi/t 'it may comer-ff@ Be it lrnown that l', GLENN Bnnnnrfr, a. citizen oi tile-United States, residing the city or Grand Rapids, Michigan, have inain new and useful improv Ynents Keyboard ior Calc .mt a or which the renewing is a speci- My invention rotates to improvements in auxiliary keyboards or eacuating Inashines.v

objects or "nis invention are l'ir .pro le enauzriiiaryirey'ooardmwnicn may readily attached detached rorn the in chine. Second, tol provide an auxiliar Keyboard which may have a. transverse vertical rnovernent. Third, to provide en auxiliary keyboard having an improved key latcninff and releasing means. Fourth, tol provide auxiliary 4lreyooard which may loe tilted loaclnvardly Without det-aching from machine, to expose, the regt-dar keyboard of the calculating machine. Firth, to

.provide auxiliary keyboard having depressible Ways. Sixtlnto provide improved auxiliary rneans for controlling the set o? groeps of keys on the keyboard of a irey set machine and preserving and repeating the operat on indefinitely. n y v Further objects, and ronjgects relating to structurai detaiis, Will definitely appear from t'ne detailed description to follow.

l accomplish the objects of my invention by the devices and means described in the following specification. f l i The invention is clearly defined and pointed out in the oieiins.

structure vv'nieli is .e preferred embodirnent of invention is ciearly illustrated in 'die accompanying dratvine forming a part of this specification, in which:

Figure is a plan vievv of a `calculating machine embodying the features of my invention as applied to suon an ladding inacliine as described, in my U. S. Patent aal-976,336, issued Nov. 22, 1910. Fig. H is an enlarged detail elevation oi the right side` of rny improved niacliine showing e portion oi'A adding machine. Eig. Hl is a detail or the parte appearing in Fig. il, showing a portion of the extreme rear hinged portion or' my auxiliary keyboard in elevated position as swung back, Fig. V is a front improved structure on sectional View or' my Y il, looking toward tne iine sl-/l of Fig ri lit.

in the drawing similar reference characters refer to simil-er parts throughout the several views, and the sectional views are 'taken looking in the direction of 'the littie arrows at the ends of the section lines.

Referring to tlie numbered parts of the dra'av'ing, the body or elle auxiliary keyboard consists of the top plate 3 which has slots receiving the lreystems 2 of the 'keys 30 is the lower guide plate for same.

27 are side piates.

6, 6 are lifting nondes.

5 is a finger hold.

28 and 29 are cross or rarne stay "jars e 1s a releasing sliding plate perforated for enc'n rey stein and having a universal cooperating portion adapted to engage the ley'stern and release tire latter vviien said reieaseis forced forwardly by the finger liold l. The spring i0 is connected to the plate and at its rear end to frame loar 28 and lreystein and draw saine forwardly miensing them vvlieniatelied on the piste 3, when they will all quickly return upwardly to normal position because of the springs 12.

1e is a single roller mounted at tlie central rea-r portion of ,my device traveiing on transverse guide-Way or rod 16 and supported bby said guide-way. Hook shaped ears 16 are secured to the sarne and pass beneath the rod 16. These ears are of suoli shape that at a certain point in the elevation of the forward portion of my device, the entire auxiliary keyboard may be moved loaclrwerdly by a sliding movement and enirely disconnected from the rails or rods and removed from the machine entirely.

7, Y are flange Wheels at the forward portion or' my device traveling on the transverse rail or-rod which is parallel to rail 16. The rod orrail 15 contains notches 15 adapted to position said auxiliary keyboard inthe proper column position. See'F ig. I. Vl`9-is apointer'adapted to aline with the respective dials 31. The dials 31 show through -the case 32.Which isof any desired construction, preferably like that of my 'former patent. Thus it will be readily seen that by grasping the finger piece 5, the auxiliary keyboard may be moved across the ma- .,chine atwill and set at any required column positioni p I On the case 32 of the adding machlne are attached brackets 19 having arms 19 at forwardV portion and at rear brackets 20 havf ing arms 20'.- Between these arms 20 1s `pivotally 'mounted a frame composed of the arms 21 andcrossstay rod 16. The arm 21 at the left'side is in form of a bell crank j f `having downwardly extending portion 214.', At front of machine is a frame composedof,

arms 22 and cross stay rod 15 which is pivv y otally mounted between the arms 19. Arm

' 22 on left side has a downwardly extending.

` -5 portion 22 vto corresp nd` to projection 21 betweenwhich two arms extend the bar 25 on leftsideof'machine, Between arm 22 and arm"19"is lthe spring23 of sufficient strength to elevate keyboard and h old same normally in upper position. Thus 1t will. be

seen that rods 16 and 15 move in synchrony again-st tensionqof spring 23 and constitute -a parallelruler action.

i wthe auxiliarykeyboard is depressed at any vpoint,`1it will have al parallel movement with reference Vto the plane of the main keyboard ByA reasonfof the arms 26 at the rear, when ovfthefadding machine. WVhen not in use, the auxiliary'keyboard'may be tilted back as. shown in Fig. 1H, a hook 16 engaging` under'zrail 16 and forming a hinge.

The purpose of the auxiliary keyboard is to avoid the necessity of lmoving the set in the keyboard in operations of multiplication or division as is the common custom with calculating machine such as the Barrett illustrated in my patent above referred to and to preserve the set of the machine indeinitely by mechanical-means for any purpose: This is accomplished by latching in depressed position, the keys on the auxiliary keyboard, of any desired multiplicand or group. A depression of the entire auxiliary keyboard then depresses like keys in the reg# ular keyboard of the machine beneath it. Then by releasing these keys of the main keyboard and moving the auxiliary keyboard and depressing, the same digits may be set upiin the regu-lar keyboard but in column of the-lower or a higher denomination as hereinafter described.

`My auxiliarykeyboard is of usein mechanically preserving any particular set of the machine. By tilting the auxiliary key-J board back and using the adding machine regularly, a total of the totals may be preserved. Thus, Suppose an operator desires to know the total amount of statements at the first of any month. After ascertaining the sum of the first account added, he lowers his auxiliary keyboard into'position shown inv Fig. I. Then he depresses on the auxiliary keyboard digits corresponding to'tliose shown on the dials. Then he tilts the auxiliary keyboard backwardly, clears his ma. chine and foots the next set of items. After ascertaining this amount and recording saine if desired, he lowers the auxiliary keyboard and forcibly depresses same which operation depresses corresponding keys on the reg- ;ular keyboard of his adding machine, then by pulling the handle, adds and totals the recorded on the auxiliary keyboard) and (the amount of the last addition. He can then depress in the auxiliary keyboard this last grand total, tilt his auxiliary keyboard back, clear his machine, and proceed as before. At the end of his work he can see at anglance4 what his grand total is. Such a device makes a duplex machine out of any regular model such as said Barrett, described 'in saidA patent #976,336 above referred to;

This auxiliary keyboardis also useful for` a further purpose. Oftentimes it is necessary or desirable to foot some sub items and obtain their sum independently of the main total. For instance, in footing a statement, the total of $125.36 is reached, then the operator comes across a lset of items which he wishes totaled separately and at the same time this sub total addedto total already acquired,namely, $425.36. He lowers his auxiliary keyboard, copies thereon this sum, n

Then he lowers his keyboard and depresses same, forcibly pulls his handle, and-'the result is $498.49. He then elevates his auxiliary keyboard and proceeds as before.

The operation of the deviceV in connection with multiplication, is as follows. Suppose we Wish to multiply 3921.46 by 125. First place auxiliary keyboardV in position shown in Fig. l, the pointer 9 alining with dial of first column. Then depress and latch auxiliary keyboard keys representing the figure 3921.46. Next, either byI use of ears 6 or finger piece 5depress entire auxiliary keyboard which will, of course, cause a set up in the regular keyboard' of the adding machine of a like130 number. Then depress the regular repeat button indicated in Fig. I as 33 and pull the handle five times (equal to units digit of multiplier). Release depressed keys in regular adding machine keyboard and move auxiliary keyboard one column toward the left until pointer alines with tens dial, depress auxiliary keyboard as before and pull handle twice (for the 2 of the multiplier) release keys on adding machine, move `auxiliary keyboard another column to left, depress as before, and pull handle once. The result shown on dials is product of 3921.46 multiplied by 125. Thus one of the objects of my device will be understood,-namely, to avoid the necessity of setting up the multiplicand 3921.46 in the keyboard more than once. Were it not for such a device, it would have been necessary to set up this complete number three times in order to multiply by 125. The same process may be followed in division operation somewhat in a reverse order, as wlll be understood by those familiar with key setting adding machines.

I have shown my improvement in its preferred form and it appears as zin-auxiliary keyboard for many purposes. It can be greatly varied and modified. I desire to claim the same specically as shown and also broadly as indicated by the appended claims.

Having thus described my invention. what I claim as new and desire to secure by Letters Patent is:

1. In an auxiliary keyboard for calculating machines the combination of depressible latchable key-stems; springs for returning. same to normal position; a releasing slide adapted to abut said keystems and unlatch same; a spring for returning said releasing slide to normal position; contact plates carried by said keystems; a suitable tiltable frame comprising stayrod and guide plates for carrying said keystems; suitable mounting for said tiltable frame comprising two flanged wheels at one end and a single wheel at the other; a pointer carried by said tiltable frame; lifting handles-attached to said tiltable frame; suitable depressible ways for said mounting wheels comprising two swinging frames, each consisting of a bearing rod and end pieces, one of said rods having positioning notches or grooves; suitable supports for said swinging frames; pivoted parallel ruler connection between said swinging frames and means for maintaining said Uopies'of this patent may be obtained. for five cents each, by addressing the swinging frames in normal stantially as described.

2. In an auxiliary keyboard for calculating machines, the combination of depressible latchable keystems; springs for returning same to normal position; a releasing slide adapted to release said keystems when in latched position; a suitable tiltable frame for carrying said keystems; suitable mountings for said tiltable frame, comprising flanged rollers; a pointer vcarried by said tiltable frame; suitable depressible Ways for said mountings for said tiltable frame, consisting of swinging frames havposition, subings, adapted to move in synchrony; means for pivotally engaging the rear end of said tiltable frame with one of said depressible ways; means for laterally positioning said bearings in said ways; a spring for holding said depressible ways in normal position; and a lift for elevating the forward portion of said tiltable frame, substantially as described.

4.-. In an auxiliarykeyboard foran adding machine, the combination of depressible, latchable keystems; means for unlatching said keystems; a tiltable frame for carrying said keystems; suitable bearings at each end of said tiltable frame; depressible ways for said bearings; pivotal connection between one end of said tiltable frame and one of said depressible ways; a spring for maintaining said depressible ways in normal position; and means for positioning said bearings for said tiltable frame on said ways, substantially as described.

In witness whereof, I have hereunto set my hand and seal in the presence of two 110 witnesses.

GLENN J. BARRETT. [1.. s]

Witnesses:

EVERETT'E. THAYER, FRANK W. MosHER.

Commissioner of Patents.

Washington. ID. C. 

